Sewing machine



vv. E. TURNER.

SEWING MACHINE'.

APPLICATION FILED APR. I8, I92I'.

lgw, Patented Aug. 229 w22.

fifi@ a L uw INVENTOR.

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PATENT WLLIAM E. TURNER, OF ll-lCOIllIi/,` WASHNGTON.

SEWING MACHINE. y v.,

Specification of Letters Patent.

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Patented Aug. 22, i922.

Application filed April 18, 1921. Serial No. 462,182.

To all whom t may concern:

Be it known that llVrLLIAM E. TURNER, a citizen oit the United States,residing at Tacoma, in the county of Pierce and State of Washington, hasinvented new and useful Improvements in Sewing Machines, of which thefollowing is a specification.

rlhe present invention relates to improvements in needle plates intendedprimarily, though not exclusively, for use on machines for stitchingsoles of shoes.

It is well known in the art to provide a needle plate having thereon aremovable cutter whereby the machine may be used for stitching rubbersoles in which no channel is to be cut, hy simply removing the cutter.This invention relates more particularly to the means for holding theneedle plate in position upon the needle plate cap and also to the.means 'tor iixedly holding the cutter in position upon the needle plate.

An object of this invention is to provide an extremely simple andefficient meansl for locking the needle plate upon the needle plate capand for locking the cutter in position upon the needle plate.

A Jfurther object of the invention is to simplify the needle plateconstruction, thereby cheapening` the cost of production of the needleplate, and to provide a single means which will simultaneously serveboth to hold the needle plate in position upon the cap and to lock thecutter against movement relatively to the needle plate.

The above are the principal objects oi the invention, and they, as wellas other objects of a more minut-e character, will become obvious asthis description proceeds.

ln order that the invention may be clear, there is illustrated in theaccompanying drawings one embodiment of the invention, and in thesedrawings:

Figure 1 is a plan view of the needle plate cap showing the needle plateapplied thereto.

Figures 2 and 3 are cross sectional views on the lines 2-2 and 3 3respectively, of Figure 1.

Figure 4 is a perspective of the needle plate, and

Figure 5 is a perspective of the cutter removed trom the needle plate.

Referring to the accompanying drawings tor a more detailed description,10 indicates a needle plate cap which may be secured to a machine in anysuitable manner, as by the usual laterally extending ears 11. At the lnorder to lock the needle plate against sliding movement longitudinallyof the guide way, a U-shaped slot 16 may be formed in the needle plateso as to extend inwardly thereof trom its rear end. A screw 17 may beset into the needle plate cap on -a line with the slot so that when theneedle plate is positioned within the guide way, the screw is in theslot. As will be observed from an inspection oit' Fig. 4, the needleplate around the edges oi. the slot is countersunk so that when thescrew 17 is tightened against the needle plate to clamp the latter inposition, the screw head will be within the countersink.

The needle plate has thereon a removable cutter 1S formed with a base 19having beveled side edges 20. The base of the cutter tits within agroove or guide way 21 extending from a lateral edge of the needle plateslightly into the needle plate. The groove is formed with undercut sidewalls 22 tor the purpose of forming a dovetail joint with the side wallsof the cutter base 19. It will be evident that by reason of this lockingjoint between the cutter and its shank receivino: groove, the cutterwill be held against all movement. except withdrawal from the groove.However, when the needle plate is moved. into the position shown in Fig.1 within its guide way, the side wall of the guide way serves not onlyto hold the needle plate in position, but also serves to lock the cutterin position against withdrawal from its seat.

Obviously, in order 'to move or dislodge the cutter, it is necessary towithdraw the needle plate at least partially from its guide way, theguide way thereby serving the dual function of locking both the needleplate and the cutter in position.

lt will be clear to one skilled in the art that numerous modilicationsmight be made in the described and illustrated embodiment of myinvention While still retaining its .essential features which are moreclearly defined in the following claims.

What is claimed is: o v

l. In combination, a needle plate cap, a needle plate on said Cap, aremovable cutter on said needle plate and a single means serving both tohold. said needle plate against movement on said cap and to lock saidoutter in position "on the needle plate.

2. In `Combination, a needle plate cap having a guideway thereon, aneedle 4plate slidable longitudinally of said guideiif'ay and aremovable outter en said needle plate, said yguideivay serving both Atohold the needle plate yagainst moveu'ient relatively to said .oap andthe' Cutter against movement relatively to `said needle plate. f

' '3. In eombinatiomlav needle plate cap hav'- ing ya yguidevvaytherein, a yneedle plate slidable longitudinally7 ofsaid guideway, saidneedle plate having a groove Closed at one end by'a-Wall of'sa'idguideway, and a removable cutterin said groove,said cutter4being,removable only when the needle plate is Withdrawn at leastpartially from the -guideway 4'.v ln combination., a needle plate eaphaving a guidevvay thereon, a needle plate slidvable longitudinally of'said guidevvay and a removablev cutter on said needle plate,v saidguideway serving both to hold the needle plate against movementrelatively lto said Vcap and the eutteragainst movement rel'-dovetail'ed therein, said needle plate having a groove therein open atone end, said open end being at an edge of the plate meeting theguidevvay Wall,l a removable cutter .in said'needle plate having a shankmaking a dovetail joint with said groove, said guidev".ivay servinglioth.t0 hol dthe needle plate'in i position on the .cap andto hold saidcutter in positiony onisaid needle plate.

6. In combination, a needle plate cap 'having a guideivay thereon,'aneedle plateslid vable' longitudinally of the guidevvay and dovetailedtherein, Ysaid needle plate having a groove therein open Iat one end,saidepen end rbeing at an edge of the,v plate meeting the gu'idewayWall, a removable Cutter in said 'needle plate having a shank making adovetail joint with said groove, said guideivay' serving both to holdthe needle plate in position on the capand to hold said cutter 'inposition on said needle plate, the Cutter being removable only 'when theneedle plate is at least partially xif'ithdra'ivn from the guide Way. y

'lntestimony whereof l have Ahereunto set my hand. v 'lVlLLAM E. TURNER,t

